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[u/mrichter/AliRoot.git] / TOF / AliTOFtracker.cxx
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596a855f 1/**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
3 * *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
6 * *
7 * Permission to use, copy, modify and distribute this software and its *
8 * documentation strictly for non-commercial purposes is hereby granted *
9 * without fee, provided that the above copyright notice appears in all *
10 * copies and that both the copyright notice and this permission notice *
11 * appear in the supporting documentation. The authors make no claims *
12 * about the suitability of this software for any purpose. It is *
13 * provided "as is" without express or implied warranty. *
14 **************************************************************************/
74ea065c 15// AliTOFtracker Class
16// Task: Perform association of the ESD tracks to TOF Clusters
17// and Update ESD track with associated TOF Cluster parameters
18//
19// -- Authors : S. Arcelli, C. Zampolli (Bologna University and INFN)
20// -- Contacts: Annalisa.De.Caro@cern.ch
21// -- : Chiara.Zampolli@bo.infn.it
22// -- : Silvia.Arcelli@bo.infn.it
23//--------------------------------------------------------------------
596a855f 24
2871e58d 25#include <Rtypes.h>
571dda3d 26
74ea065c 27#include "TClonesArray.h"
571dda3d 28
d076c8d5 29#include "AliLog.h"
74ea065c 30#include "AliRun.h"
31#include "AliModule.h"
596a855f 32
571dda3d 33#include "AliTOFcluster.h"
34#include "AliTOFtrack.h"
35#include "AliTOFGeometry.h"
36#include "AliTOFtracker.h"
37
d4754572 38
39#include "AliTrackPointArray.h"
40#include "AliAlignObj.h"
41
596a855f 42ClassImp(AliTOFtracker)
43
74ea065c 44//_____________________________________________________________________________
45AliTOFtracker::AliTOFtracker(AliTOFGeometry * geom, Double_t parPID[2]) {
46 //AliTOFtracker main Ctor
47
d3c7bfac 48 //fHoles=true;
74ea065c 49 fNseeds=0;
50 fNseedsTOF=0;
51 fngoodmatch=0;
52 fnbadmatch=0;
53 fnunmatch=0;
54 fnmatch=0;
55 fGeom = geom;
56 fTOFpid = new AliTOFpidESD(parPID);
57 fR=378.;
58 fTOFHeigth=15.3;
59 fdCut=3.;
60 fDy=AliTOFGeometry::XPad();
61 fDz=AliTOFGeometry::ZPad();
62 fDx=1.5;
c0545837 63 fDzMax=35.;
64 fDyMax=50.;
74ea065c 65 fSeeds=0x0;
66 fTracks=0x0;
67 fN=0;
d3c7bfac 68 fHoles = fGeom->GetHoles();
74ea065c 69}
70//_____________________________________________________________________________
71AliTOFtracker::AliTOFtracker(const AliTOFtracker &t):AliTracker() {
72 //AliTOFtracker copy Ctor
73
74 fHoles=t.fHoles;
75 fNseeds=t.fNseeds;
76 fNseedsTOF=t.fNseedsTOF;
77 fngoodmatch=t.fngoodmatch;
78 fnbadmatch=t.fnbadmatch;
79 fnunmatch=t.fnunmatch;
80 fnmatch=t.fnmatch;
81 fGeom = t.fGeom;
82 fTOFpid = t.fTOFpid;
83 fR=t.fR;
84 fTOFHeigth=t.fTOFHeigth;
85 fdCut=t.fdCut;
86 fDy=t.fDy;
87 fDz=t.fDz;
a6a9820c 88 fDx=t.fDx;
89 fDzMax=t.fDzMax;
90 fDyMax=t.fDyMax;
74ea065c 91 fSeeds=t.fSeeds;
92 fTracks=t.fTracks;
93 fN=t.fN;
94}
95//_____________________________________________________________________________
74ea065c 96Int_t AliTOFtracker::PropagateBack(AliESD* event) {
97 //
98 // Gets seeds from ESD event and Match with TOF Clusters
99 //
100
101
102 //Initialise some counters
103
104 fNseeds=0;
105 fNseedsTOF=0;
106 fngoodmatch=0;
107 fnbadmatch=0;
108 fnunmatch=0;
109 fnmatch=0;
110
111 Int_t ntrk=event->GetNumberOfTracks();
112 fNseeds = ntrk;
7b61cd9c 113 fSeeds= new TClonesArray("AliESDtrack",ntrk);
74ea065c 114 TClonesArray &aESDTrack = *fSeeds;
115
116
117 //Load ESD tracks into a local Array of ESD Seeds
118
119 for (Int_t i=0; i<fNseeds; i++) {
120 AliESDtrack *t=event->GetTrack(i);
121 new(aESDTrack[i]) AliESDtrack(*t);
122 }
123
124 //Prepare ESD tracks candidates for TOF Matching
125 CollectESD();
126
127 //First Step with Strict Matching Criterion
128 MatchTracks(kFALSE);
7b61cd9c 129 /*
130 for (Int_t ijk=0; ijk<fN; ijk++) {
131 AliInfo(Form("%4i %4i %f %f %f %f %f %2i %1i %2i %1i %2i",ijk, fClusters[ijk]->GetIndex(),fClusters[ijk]->GetZ(),fClusters[ijk]->GetR(),fClusters[ijk]->GetPhi(), fClusters[ijk]->GetTDC(),fClusters[ijk]->GetADC(),fClusters[ijk]->GetDetInd(0),fClusters[ijk]->GetDetInd(1),fClusters[ijk]->GetDetInd(2),fClusters[ijk]->GetDetInd(3),fClusters[ijk]->GetDetInd(4)));
132 }
133 */
74ea065c 134
135 //Second Step with Looser Matching Criterion
136 MatchTracks(kTRUE);
137
d076c8d5 138 AliInfo(Form("Number of matched tracks: %d",fnmatch));
139 AliInfo(Form("Number of good matched tracks: %d",fngoodmatch));
140 AliInfo(Form("Number of bad matched tracks: %d",fnbadmatch));
74ea065c 141
142 //Update the matched ESD tracks
143
144 for (Int_t i=0; i<ntrk; i++) {
145 AliESDtrack *t=event->GetTrack(i);
146 AliESDtrack *seed =(AliESDtrack*)fSeeds->UncheckedAt(i);
147 if(seed->GetTOFsignal()>0){
148 t->SetTOFsignal(seed->GetTOFsignal());
149 t->SetTOFcluster(seed->GetTOFcluster());
150 AliTOFtrack *track = new AliTOFtrack(*seed);
151 t->UpdateTrackParams(track,AliESDtrack::kTOFout);
152 delete track;
153 }
154 }
155
156
157 //Make TOF PID
158 fTOFpid->MakePID(event);
159
7bf28302 160 if (fSeeds) {
161 fSeeds->Delete();
162 delete fSeeds;
163 fSeeds = 0x0;
164 }
165 if (fTracks) {
166 fTracks->Delete();
167 delete fTracks;
168 fTracks = 0x0;
169 }
74ea065c 170 return 0;
171
172}
173//_________________________________________________________________________
174void AliTOFtracker::CollectESD() {
175 //prepare the set of ESD tracks to be matched to clusters in TOF
176
177 fTracks= new TClonesArray("AliTOFtrack");
178 TClonesArray &aTOFTrack = *fTracks;
179 for (Int_t i=0; i<fNseeds; i++) {
180
181 AliESDtrack *t =(AliESDtrack*)fSeeds->UncheckedAt(i);
182 if ((t->GetStatus()&AliESDtrack::kTPCout)==0)continue;
183
184 // TRD good tracks, already propagated at 371 cm
185
56da420e 186 AliTOFtrack *track = new AliTOFtrack(*t); // New
187 Double_t x = track->GetX(); //New
188
189 if (((t->GetStatus()&AliESDtrack::kTRDout)!=0 ) &&
d3c7bfac 190 ( x >= fGeom->RinTOF()) ){
74ea065c 191 track->SetSeedIndex(i);
192 t->UpdateTrackParams(track,AliESDtrack::kTOFout);
193 new(aTOFTrack[fNseedsTOF]) AliTOFtrack(*track);
194 fNseedsTOF++;
195 delete track;
196 }
197
198 // Propagate the rest of TPCbp
199
200 else {
74ea065c 201 if(track->PropagateToInnerTOF(fHoles)){ // temporary solution
202 // if(track->PropagateToInnerTOF(fGeom->GetHoles())){
203 track->SetSeedIndex(i);
204 t->UpdateTrackParams(track,AliESDtrack::kTOFout);
205 new(aTOFTrack[fNseedsTOF]) AliTOFtrack(*track);
206 fNseedsTOF++;
207 }
208 delete track;
209 }
210 }
211
7b61cd9c 212 AliInfo(Form("Number of TOF seedds %i",fNseedsTOF));
213
74ea065c 214 // Sort according uncertainties on track position
215 fTracks->Sort();
216
217}
218//_________________________________________________________________________
219void AliTOFtracker::MatchTracks( Bool_t mLastStep){
220
221 //Match ESD tracks to clusters in TOF
222
74ea065c 223 Int_t nSteps=(Int_t)(fTOFHeigth/0.1);
7bf28302 224
225 //PH Arrays (moved outside of the loop)
226 Float_t * trackPos[4];
227 for (Int_t ii=0; ii<4; ii++) trackPos[ii] = new Float_t[nSteps];
228 Int_t * clind[6];
229 for (Int_t ii=0;ii<6;ii++) clind[ii] = new Int_t[fN];
74ea065c 230
c0545837 231 for (Int_t iseed=0; iseed<fNseedsTOF; iseed++) {
74ea065c 232
c0545837 233 AliTOFtrack *track =(AliTOFtrack*)fTracks->UncheckedAt(iseed);
74ea065c 234 AliESDtrack *t =(AliESDtrack*)fSeeds->UncheckedAt(track->GetSeedIndex());
7bf28302 235 if(t->GetTOFsignal()>0. ) continue;
74ea065c 236 AliTOFtrack *trackTOFin =new AliTOFtrack(*track);
74ea065c 237
d3c7bfac 238 // Some init
74ea065c 239
240 Int_t index[10000];
241 Float_t dist[10000];
242 Float_t cxpos[10000];
243 Float_t crecL[10000];
c0545837 244 TGeoHMatrix global[1000];
74ea065c 245
246 // Determine a window around the track
247
248 Double_t x,par[5];
249 trackTOFin->GetExternalParameters(x,par);
250 Double_t cov[15];
251 trackTOFin->GetExternalCovariance(cov);
252 Float_t scalefact=3.;
253 Double_t dphi=
254 scalefact*
255 ((5*TMath::Sqrt(cov[0]) + 0.5*fDy + 2.5*TMath::Abs(par[2]))/fR);
256 Double_t dz=
257 scalefact*
258 (5*TMath::Sqrt(cov[2]) + 0.5*fDz + 2.5*TMath::Abs(par[3]));
259
260 Double_t phi=TMath::ATan2(par[0],x) + trackTOFin->GetAlpha();
261 if (phi<-TMath::Pi())phi+=2*TMath::Pi();
262 if (phi>=TMath::Pi())phi-=2*TMath::Pi();
263 Double_t z=par[1];
264
c0545837 265 //upper limit on window's size.
266
267 if(dz> fDzMax) dz=fDzMax;
268 if(dphi*fR>fDyMax) dphi=fDyMax/fR;
269
270
74ea065c 271 Int_t nc=0;
7b61cd9c 272
74ea065c 273 // find the clusters in the window of the track
274
275 for (Int_t k=FindClusterIndex(z-dz); k<fN; k++) {
7b61cd9c 276
74ea065c 277 AliTOFcluster *c=fClusters[k];
278 if (c->GetZ() > z+dz) break;
279 if (c->IsUsed()) continue;
280
7b61cd9c 281 //AliInfo(Form(" fClusters[k]->GetZ() (%f) z-dz (%f) %4i ", fClusters[k]->GetZ(), z-dz, k));
282
74ea065c 283 Double_t dph=TMath::Abs(c->GetPhi()-phi);
284 if (dph>TMath::Pi()) dph-=2.*TMath::Pi();
9b49e4c9 285 if (TMath::Abs(dph)>dphi) continue;
74ea065c 286
287 clind[0][nc] = c->GetDetInd(0);
288 clind[1][nc] = c->GetDetInd(1);
289 clind[2][nc] = c->GetDetInd(2);
290 clind[3][nc] = c->GetDetInd(3);
291 clind[4][nc] = c->GetDetInd(4);
292 clind[5][nc] = k;
c0545837 293 Char_t path[100];
294 Int_t ind[5];
295 ind[0]=clind[0][nc];
296 ind[1]=clind[1][nc];
297 ind[2]=clind[2][nc];
298 ind[3]=clind[3][nc];
299 ind[4]=clind[4][nc];
300 fGeom->GetVolumePath(ind,path);
301 gGeoManager->cd(path);
302 global[nc] = *gGeoManager->GetCurrentMatrix();
74ea065c 303 nc++;
304 }
305
7b61cd9c 306 //if (nc) AliInfo(Form("seed for TOF %4i and number of clusters in the track window %4i (cluster index %4i) %4i",i,nc, clind[5][0], fN));
307
74ea065c 308 //start fine propagation
309
310 Int_t nStepsDone = 0;
311 for( Int_t istep=0; istep<nSteps; istep++){
312
d3c7bfac 313 Float_t xs=fGeom->RinTOF()+istep*0.1;
74ea065c 314 Double_t ymax=xs*TMath::Tan(0.5*AliTOFGeometry::GetAlpha());
315
316 Bool_t skip=kFALSE;
317 Double_t ysect=trackTOFin->GetYat(xs,skip);
318 if(skip)break;
319 if (ysect > ymax) {
320 if (!trackTOFin->Rotate(AliTOFGeometry::GetAlpha())) {
321 break;
322 }
323 } else if (ysect <-ymax) {
324 if (!trackTOFin->Rotate(-AliTOFGeometry::GetAlpha())) {
325 break;
326 }
327 }
328
329 if(!trackTOFin->PropagateTo(xs)) {
330 break;
331 }
332
333 nStepsDone++;
334
335 // store the running point (Globalrf) - fine propagation
336
337 Double_t x,y,z;
338 trackTOFin->GetGlobalXYZ(x,y,z);
339 trackPos[0][istep]= (Float_t) x;
340 trackPos[1][istep]= (Float_t) y;
341 trackPos[2][istep]= (Float_t) z;
342 trackPos[3][istep]= trackTOFin->GetIntegratedLength();
343 }
344
345
346 Int_t nfound = 0;
347 for (Int_t istep=0; istep<nStepsDone; istep++) {
348
349 Bool_t isInside =kFALSE;
350 Float_t ctrackPos[3];
351
352 ctrackPos[0]= trackPos[0][istep];
353 ctrackPos[1]= trackPos[1][istep];
354 ctrackPos[2]= trackPos[2][istep];
355
356 //now see whether the track matches any of the TOF clusters
357
358 for (Int_t i=0; i<nc; i++){
359 Int_t cind[5];
360 cind[0]= clind[0][i];
361 cind[1]= clind[1][i];
362 cind[2]= clind[2][i];
363 cind[3]= clind[3][i];
364 cind[4]= clind[4][i];
365 Bool_t accept = kFALSE;
c0545837 366 if( mLastStep)accept = (fGeom->DistanceToPad(cind,global[i],ctrackPos)<fdCut);
367 if(!mLastStep)accept = (fGeom->IsInsideThePad(cind,global[i],ctrackPos));
74ea065c 368 if(accept){
369 if(!mLastStep)isInside=kTRUE;
c0545837 370 dist[nfound]=fGeom->DistanceToPad(cind,global[i],ctrackPos);
74ea065c 371 crecL[nfound]=trackPos[3][istep];
372 index[nfound]=clind[5][i]; // store cluster id
d3c7bfac 373 cxpos[nfound]=fGeom->RinTOF()+istep*0.1; //store prop.radius
74ea065c 374 nfound++;
375 if(isInside)break;
376 }//end if accept
377 } //end for on the clusters
9b49e4c9 378
379
74ea065c 380 if(isInside)break;
381 } //end for on the steps
382
9b49e4c9 383
384
74ea065c 385 if (nfound == 0 ) {
386 fnunmatch++;
7bf28302 387 delete trackTOFin;
74ea065c 388 continue;
389 }
390
391 fnmatch++;
392
393 // now choose the cluster to be matched with the track.
394
395 Int_t idclus=0;
396 Float_t recL = 0.;
397 Float_t xpos=0.;
398 Float_t mindist=1000.;
399 for (Int_t iclus= 0; iclus<nfound;iclus++){
400 if (dist[iclus]< mindist){
401 mindist = dist[iclus];
402 xpos = cxpos[iclus];
403 idclus =index[iclus];
404 recL=crecL[iclus]+fDx*0.5;
405 }
406 }
407
408 AliTOFcluster *c=fClusters[idclus];
c0545837 409 c->Use(); //AliInfo(Form("I am using the cluster"));
74ea065c 410
411 // Track length correction for matching Step 2
412
413 if(mLastStep){
414 Float_t rc=TMath::Sqrt(c->GetR()*c->GetR() + c->GetZ()*c->GetZ());
415 Float_t rt=TMath::Sqrt(trackPos[0][70]*trackPos[0][70]
416 +trackPos[1][70]*trackPos[1][70]
417 +trackPos[2][70]*trackPos[2][70]);
418 Float_t dlt=rc-rt;
419 recL=trackPos[3][70]+dlt;
420 }
421
422 if (
423 (c->GetLabel(0)==TMath::Abs(trackTOFin->GetLabel()))
424 ||
425 (c->GetLabel(1)==TMath::Abs(trackTOFin->GetLabel()))
426 ||
427 (c->GetLabel(2)==TMath::Abs(trackTOFin->GetLabel()))
428 ) {
429 fngoodmatch++;
d3c7bfac 430
431 //AliInfo(Form(" track label good %5i",trackTOFin->GetLabel()));
432
74ea065c 433 }
434 else{
435 fnbadmatch++;
d3c7bfac 436
437 //AliInfo(Form(" track label bad %5i",trackTOFin->GetLabel()));
438
74ea065c 439 }
440
441 delete trackTOFin;
442
43f77f2d 443 Double_t tof=AliTOFGeometry::TdcBinWidth()*c->GetTDC()+32; // in ps
74ea065c 444 t->SetTOFsignal(tof);
ee77ad87 445 //t->SetTOFcluster(c->GetIndex()); // pointing to the digits tree
446 t->SetTOFcluster(idclus); // pointing to the recPoints tree
74ea065c 447 Double_t time[10]; t->GetIntegratedTimes(time);
448 Double_t mom=t->GetP();
304864ab 449 for(Int_t j=0;j<=AliPID::kSPECIES;j++){
450 Double_t mass=AliPID::ParticleMass(j);
74ea065c 451 time[j]+=(recL-trackPos[3][0])/3e-2*TMath::Sqrt(mom*mom+mass*mass)/mom;
452 }
453
454 AliTOFtrack *trackTOFout = new AliTOFtrack(*t);
455 trackTOFout->PropagateTo(xpos);
456 t->UpdateTrackParams(trackTOFout,AliESDtrack::kTOFout);
457 t->SetIntegratedLength(recL);
458 t->SetIntegratedTimes(time);
459
460 delete trackTOFout;
461 }
7bf28302 462 for (Int_t ii=0; ii<4; ii++) delete [] trackPos[ii];
463 for (Int_t ii=0;ii<6;ii++) delete [] clind[ii];
74ea065c 464}
465//_________________________________________________________________________
7b61cd9c 466Int_t AliTOFtracker::LoadClusters(TTree *cTree) {
74ea065c 467 //--------------------------------------------------------------------
468 //This function loads the TOF clusters
469 //--------------------------------------------------------------------
470
7b61cd9c 471 TBranch *branch=cTree->GetBranch("TOF");
74ea065c 472 if (!branch) {
7b61cd9c 473 AliError("can't get the branch with the TOF clusters !");
74ea065c 474 return 1;
475 }
476
7b61cd9c 477 TClonesArray dummy("AliTOFcluster",10000), *clusters=&dummy;
478 branch->SetAddress(&clusters);
74ea065c 479
7b61cd9c 480 cTree->GetEvent(0);
481 Int_t nc=clusters->GetEntriesFast();
482 AliInfo(Form("Number of clusters: %d",nc));
74ea065c 483
7b61cd9c 484 for (Int_t i=0; i<nc; i++) {
485 AliTOFcluster *c=(AliTOFcluster*)clusters->UncheckedAt(i);
7b61cd9c 486 fClusters[i]=new AliTOFcluster(*c); fN++;
487
488 //AliInfo(Form("%4i %4i %f %f %f %f %f %2i %1i %2i %1i %2i",i, fClusters[i]->GetIndex(),fClusters[i]->GetZ(),fClusters[i]->GetR(),fClusters[i]->GetPhi(), fClusters[i]->GetTDC(),fClusters[i]->GetADC(),fClusters[i]->GetDetInd(0),fClusters[i]->GetDetInd(1),fClusters[i]->GetDetInd(2),fClusters[i]->GetDetInd(3),fClusters[i]->GetDetInd(4)));
489 //AliInfo(Form("%i %f",i, fClusters[i]->GetZ()));
490 }
74ea065c 491
7b61cd9c 492 //AliInfo(Form("Number of clusters: %d",fN));
74ea065c 493
494 return 0;
495}
496//_________________________________________________________________________
497void AliTOFtracker::UnloadClusters() {
498 //--------------------------------------------------------------------
499 //This function unloads TOF clusters
500 //--------------------------------------------------------------------
7b61cd9c 501 for (Int_t i=0; i<fN; i++) {
502 delete fClusters[i];
503 fClusters[i] = 0x0;
74ea065c 504 }
7b61cd9c 505 fN=0;
74ea065c 506}
507
508//_________________________________________________________________________
509Int_t AliTOFtracker::FindClusterIndex(Double_t z) const {
510 //--------------------------------------------------------------------
511 // This function returns the index of the nearest cluster
512 //--------------------------------------------------------------------
513 if (fN==0) return 0;
514 if (z <= fClusters[0]->GetZ()) return 0;
515 if (z > fClusters[fN-1]->GetZ()) return fN;
516 Int_t b=0, e=fN-1, m=(b+e)/2;
517 for (; b<e; m=(b+e)/2) {
518 if (z > fClusters[m]->GetZ()) b=m+1;
519 else e=m;
520 }
521 return m;
522}
d4754572 523
524//_________________________________________________________________________
525Bool_t AliTOFtracker::GetTrackPoint(Int_t index, AliTrackPoint& p) const
526{
527 // Get track space point with index i
528 // Coordinates are in the global system
529 AliTOFcluster *cl = fClusters[index];
530 Float_t xyz[3];
531 xyz[0] = cl->GetR()*TMath::Cos(cl->GetPhi());
532 xyz[1] = cl->GetR()*TMath::Sin(cl->GetPhi());
533 xyz[2] = cl->GetZ();
534 p.SetXYZ(xyz[0],xyz[1],xyz[2]);
535
536 // Detector numbering scheme
537 Int_t nSector = fGeom->NSectors();
538 Int_t nPlate = fGeom->NPlates();
539 Int_t nStripA = fGeom->NStripA();
540 Int_t nStripB = fGeom->NStripB();
541 Int_t nStripC = fGeom->NStripC();
542
543 Int_t isector = cl->GetDetInd(0);
544 if (isector >= nSector)
545 AliError(Form("Wrong sector number in TOF (%d) !",isector));
546 Int_t iplate = cl->GetDetInd(1);
547 if (iplate >= nPlate)
548 AliError(Form("Wrong plate number in TOF (%d) !",iplate));
549 Int_t istrip = cl->GetDetInd(2);
550
551 Int_t stripOffset = 0;
552 switch (iplate) {
553 case 0:
554 stripOffset = 0;
555 break;
556 case 1:
557 stripOffset = nStripC;
558 break;
559 case 2:
560 stripOffset = nStripC+nStripB;
561 break;
562 case 3:
563 stripOffset = nStripC+nStripB+nStripA;
564 break;
565 case 4:
566 stripOffset = nStripC+nStripB+nStripA+nStripB;
567 break;
568 default:
569 AliError(Form("Wrong plate number in TOF (%d) !",iplate));
570 break;
571 };
572
573 Int_t idet = (2*(nStripC+nStripB)+nStripA)*isector +
574 stripOffset +
575 istrip;
576 UShort_t volid = AliAlignObj::LayerToVolUID(AliAlignObj::kTOF,idet);
577 p.SetVolumeID((UShort_t)volid);
578 return kTRUE;
579}